Noncontact communication apparatus and noncontact communication method
First Claim
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1. A noncontact communication apparatus comprising:
- an antenna resonance circuit configured to have a coil for communicating with an opposite party through electromagnetic coupling;
changing means for changing a Q-factor of said antenna resonance circuit;
control means for controlling said antenna resonance circuit to transmit and receive data to and from said opposite party at one of a plurality of communication speeds prepared beforehand, said control means further controlling said changing means to reduce said Q-factor the higher the communication speed in use;
distance detection means for detecting a distance of communication with said opposite party by monitoring resonance characteristics of the antenna resonance circuit,wherein said control means controls said changing means to reduce said Q-factor the shorter the distance detected by said distance detection means; and
a storage block configured to store correspondence table information indicating how distances of communication with said opposite party, said plurality of communication speeds, and Q-factors relative to combinations of said distances of communication with said communication speeds are interrelated, whereinsaid control means controls said changing means to change said Q-factor by referencing said correspondence table information stored in said storage block.
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Abstract
A noncontact communication apparatus is disclosed which includes: an antenna resonance circuit configured to have a coil for communicating with an opposite party through electromagnetic coupling; a changing block configured to change a Q-factor of the antenna resonance circuit; and a control block configured to control the antenna resonance circuit to transmit and receive data to and from the opposite party at one of a plurality of communication speeds prepared beforehand, the control block further controlling the changing block to reduce the Q-factor the higher the communication speed in use.
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Citations
16 Claims
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1. A noncontact communication apparatus comprising:
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an antenna resonance circuit configured to have a coil for communicating with an opposite party through electromagnetic coupling; changing means for changing a Q-factor of said antenna resonance circuit; control means for controlling said antenna resonance circuit to transmit and receive data to and from said opposite party at one of a plurality of communication speeds prepared beforehand, said control means further controlling said changing means to reduce said Q-factor the higher the communication speed in use; distance detection means for detecting a distance of communication with said opposite party by monitoring resonance characteristics of the antenna resonance circuit, wherein said control means controls said changing means to reduce said Q-factor the shorter the distance detected by said distance detection means; and a storage block configured to store correspondence table information indicating how distances of communication with said opposite party, said plurality of communication speeds, and Q-factors relative to combinations of said distances of communication with said communication speeds are interrelated, wherein said control means controls said changing means to change said Q-factor by referencing said correspondence table information stored in said storage block. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 11, 12)
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9. A noncontact communication method for use with a noncontact communication apparatus including an antenna resonance circuit configured to have a coil for communicating with an opposite party through electromagnetic coupling, and changing means for changing a Q-factor of said antenna resonance circuit, said noncontact communication method comprising:
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controlling said antenna resonance circuit to transmit and receive data to and from said opposite party at one of a plurality of communication speeds prepared beforehand; and controlling said changing means to reduce said Q-factor the higher the communication speed in use; detecting a distance of communication with said opposite party by monitoring resonance characteristics of the antenna resonance circuit, wherein said control means controls said changing means to reduce said Q-factor the shorter the distance detected by said distance detection means; and storing correspondence table information indicating how said distances of communication with said opposite party, said plurality of communication speeds, and Q-factors relative to combinations of said distances of communication with said communication speeds are interrelated, wherein the noncontact communication apparatus includes a storage block configured to perform said storing, and wherein said controlling said changing means includes changing said Q-factor by referencing said correspondence table information stored in said storage block. - View Dependent Claims (13, 14)
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10. A noncontact communication apparatus, comprising:
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an antenna resonance circuit configured to have a coil for communicating with an opposite party through electromagnetic coupling; a Q-factor changing circuit that changes a Q-factor of said antenna resonance circuit; detection circuit that detects a distance of communication with said opposite party by monitoring resonance characteristics of the antenna resonance circuit, a controller that controls said antenna resonance circuit to transmit and receive data to and from said opposite party at one of a plurality of communication speeds prepared beforehand and that controls said Q-factor changing circuit to reduce said Q-factor the higher the communication speed and the shorter the distance of communication in use; and a memory that stores correspondence table information indicating how distances of communication with said opposite party, said plurality of communication speeds, and Q-factors relative to combinations of said distances of communication with said communication speeds are interrelated, wherein said controller controls said Q-factor changing circuit to chance said Q-factor by referencing said correspondence table information stored in said storage block. - View Dependent Claims (15, 16)
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Specification